Cutting tool



Patented June 16, i924.

GERG FELSCH, OF NEUKGLLN, NEAR BERLIN, GER-MANY.

CUTTING TOOL.

Y Application filed February 3, 1322.

My invention relates to improvements inV cutting tools adapted ior turning, threadcutting, or any other metal work oi a similar nature, and more particularly in tools of the type comprising a shank having a prismatic cutting member removably'or adjustably secured thereto. One of the objects oit' the improvements is to provide a tool oi this type in which the cutting member is securely held in position on the shank, and which is simple in construction. Another object of the improvements is to provide a cutting member which can be mounted on the shank so as to present either one 'of a plurality of cutting edges in cutting' position. TW ith these and other objects in view my invention consists in the matters to be described hereinafter and particularly pointed out in the appended claims.

For the purpose of explaining the invention several examples embodying the same have been shown in the accompanying drawing 'in which the same reference characters have been used in all the views to indicate corresponding parts. kln said drawing,-

Fig. l, is a side view of the tool,

Fig. 2, is a cross-section on an enlarged scale or" the cutting member,

Fig. 3, is a plan View of Fig. l,

Fig. t. is a plan view of the tool showing the cutting member in a position different from that shown in Fig. 3, and

Fig. 5, is a cross-section showing a modification of the cutting member.

ln the example shown in Figs. l to i my improved tool comprises a shank a adapted to be held in a tool post or any other tool holding device of a lathe, planer, Shaper or any other metal working machine, and provided at its front end with a clamping meinber o bearing on the shank at its rear end and adapted to be forced into clamping engagement with a cutting member s by a screw c. The shank and clamping meml'iers are inclined downward and rearward at Serial No. 533,921.`

their front faces, so that the cutting member is clampedthereon in inclined position.

As shown the cutting member is substantially in the form of a triangular prism hav- 'ng a longitudinal il-shaped cut-out portion l at one corner providing two shoulders which are respectively parallel to the adjacent sides of the prism. VThereby two clamping shoes including respectively the faces f and f1' are formed on the cutting member which lit 'between corresponding dove-tailed clamping jaws provided at the 'tr-ont ends of the shank. a, and clamping member 7). By thus providing clamping shoes which are located at one side of the cutting member the breadth of the holder consisting or" the shank a and clamping member o is reduced, and the cutting edges e and el areshitted sidewise relativelyto the shank, said edges being disposed laterally ot the perpendicular lines passing through the middles of the basesot the clamping shoes; which vlines have been indicated inFig. '2 in dotted linesv Figs. 3 and t show thatv in the assembled tool the cutting edges are shifted either to the right or to the left from the longitudinal axis oit the holder provided by the shank 0, and clamping member b. By my improved construction I am enabled to use the tool for cutting blanks having projecting flanges or the like which are disposed relatively to the body of the blanlr at angles of degrees or less, as appears from the dotted lines shown in Fig. 3, for which purpose the shank is fixed in the tool post more or less at an angle to the blank.

It will be understood that my invention. is not limited to a construction in which the cutting member is exactly triangular in cross-section. In some cases I prefer a meniber which more or less departs from the triangular form. ln. Fig. 5 I' have shown a modification in which the face of the prism which is opposite to the cut-out portion Z1 is curved outwards. This construction is preferred for example in such cases in which one of the cutting edges e2 or e3 is located sidewise and away from the perpendicular line passing through the middle oit the opposite side ot the triangle, or in which it is desired to provide a particularly strong cutting member.

Thilo in describing the invention reference has been made to particular examples embodying the same, l wish it to be understood, that my invention is not limited to the constructions shown in the drawing, and that various changes may be made in the Construction of the tool Without departing from the invention.

I Claim:

l. A tool, Comprising` a. prismatio cutting` member formed with a plurality of eut-ting edges and with a plurality of paire oi Clamping shoulders, the shoulders of each pairl including with the side aee intermediate the same acute angles, and a holderI adapted -ior clamping engagement with either .one of said pairs oi clamping Shoulders.

25A tool, comprising a prismatic Cutting member sulostantially triangular in ere/se slectionyand formed with a plurality of eiitting ledges and with a plurality of pairs of clamping shoulders, the shoulders o'each. lpair including with the side aoe intermediatethe same acute angles and the cutting. edges being disposed each laterally of the longitudinal perpendicular plane passing through the middle of the side Ylaoe opposite `the Cutting edge, and a holder adapted for clamping engagement with either one of said pairs of clamping shoulders;

3. A; tool comprising a prismatic cutting member formed with a plurality of cutting edges and vhaving one corner cut-out longitudinally so as to provide two elamping shoulders eaehforming with a side face at 'ahead-jacent corner of the member a pair elamping surfaces, and a holder adapttor clamping engagement with either one t the pairs or Clamping Surfaces.

A tool comprising a prismatio Cutting member formed with a plurality oi' cutting edges and having one corner cut out longitudinally so as to provide two clampshoulders each 'forming with a side face t Ae adjaeent corner of the member a pair L.; surfaces, the clamping sur each pair including with the face Same acute angles, and a hold r adapted i Clamping engagement with eitljier one oit the pairs of clamping surte es.

tool Cor-iprising a prismatie Cutting member approximately triangular in oroseseetion foi-ined with a plurality of cutting edges and having one corner cut out longitudinally so as to provide two clamping shoulders each forming with a eide face at the adjacent corner of the member a pair of Clamping surfaces', the cutting edges being disposed each laterally of the longitudinal perpendicular plane passing through the middle of the side face opposite the cutting edge, and a holder adapted for Clamping en gagement with either one oi said pairs ot clamping faces,

ln testimony whereof l hereunto my Signature in the presence olf twoy witnessea GERG FELSCH.

imermediate the YIWitnesses z E. HOLTZMANN, CHARLES DUBnLL, 

